The short explanation
Fibroadenomas can grow during pregnancy because they respond to the hormones that make breast tissue grow, and some shrink again afterwards. Many stay much the same. A fibroadenoma does not usually stop you from breastfeeding, as milk is made by the surrounding normal tissue. It is sensible to tell your doctor about your pregnancy plans so they can decide whether to scan it before you conceive, as a baseline for comparison.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- If the fibroadenoma is large or has grown, some doctors discuss removing it before pregnancy, but many are simply monitored.
- During pregnancy, an ultrasound is safe if the lump changes noticeably, and the doctor can compare it with the earlier scan.
- Any new lump during pregnancy or breastfeeding should be checked separately and not assumed to be the known fibroadenoma.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This cannot tell you how your fibroadenoma will behave. Your doctor, with your scans, can plan monitoring.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- Should I have a scan before trying to conceive?
- Would you recommend removal before pregnancy?
- What changes in pregnancy should make me tell you?
- Will this affect breastfeeding?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Book an appointment soon
- See a clinician within a couple of weeks if the lump grows quickly or a new lump appears.
Raise it at a routine appointment
- Mention the fibroadenoma at your first antenatal appointment and bring your scan reports.
Sources
The evidence this explanation is built on.
- Breast lump NHS
- Breastfeeding MedlinePlus (NIH)
- Breast diseases MedlinePlus (NIH)
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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